Cylinder edge dressing tool



Sept. 22, 1931. c. A. OLSON 1,824,494

CYLINDER EDGE DRESSING TOOL Filed March 24, 1930 Patented Sept. 22, 1931 1 UNITED STATES PATENT. OFFICE CARL A. OLSON, OF OLAIRINDA, IOWA, ASSIGNOR 1'0 LISLE IANUFAGI'URING GOI- PANY, OF OLABINDA, IOWA, A CORPORATION OF IOWA mmnna EDGE nanssrne moor.

Application fled. larch 24, mo. Serial No. 438,495.

The object of this invention is to rovide an improved tool which is especial signed for use in trimming oif the le ge or projection which is commonly formed at the 5 upper end of the cylinder of an internal combustion engine because of the fact that the uppermost ring of the piston does not ordinarily travel entirely to the top of the cylinder bore.

A furtherobject' of the invention is to provide a tool for conveniently, quickly and accurately dressing u a cylinder wall and relieving it of perip eral projections or ledges preparatory to the installation of new pistons or piston rings. v

Still another object is to provide a tool of the character described which is adjustable for use with cylinders of different diameters.

With these and other objects in view my rangement and combinationof the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which Figure 1 is a perspective view of the tool.

Figure 5 is a detail plan view of a portion of the tool showing particularly the sto for 1 the cutting blade and the means for adjusting the position of the stop.

, It is well known that the constant travel of a piston such as 10 in its cylinder 12 will cause wear of the cylinder wall. The piston of an engine is ordinarily equipped with a series of rings 14 which are of resilient character and which have a tight fit with the wall of the cylinder 12. Usually the uppermost ring 14 does not travel entirely to the upper end of the bore of the cylinder and consequently the wear to which the vlinder invention consists in the construction, ar-

. do this in such manner-that the u per end ledge 16 after continued use.

When it becomes necessary to install new 50 pistons or new rings on the pistons in the cylinders of an engine, it is'necessary to 're-' move theledge or projection 16 at the upper end of each cylinder. If this is not done the new rings, which are true and square at their upper edges, will strike the ledges or projections such as 16, thus causing a click or knock.

Heretofore it has been customary for the workman to remove the ledges 16 by the use of a hand tool or abrasive material. I This is not only very slow work but it is also diflicult'by this method to make the upper end of the cylinder conform to the remaining portions of the cylinder wall which are not always worn to true cylindrical form.

My improved tool is adapted to easily and quickly remove theprojection 16 from the upper end of the cylinder wall and to will conform to the curvature 0 thememainin parts of the cylinder wall.

The ody of the tool is made up of two parts, a-main body member 18 and a cutter carrier member 20 which is adjustable relative to the member 18. Preferably the carrier member 20is formed at one side with a shank 22 which is slidably received in a cylindrical bore 24 in the opposed face of the body member 18.

The bod member 18 is provided with two spaced ro ers 26-26 which are mounted for rotation on vertical axes defined by pins 28-28 seated in bosses 30-30 of the member 18.

-The. rollers 26.are arranged on opposite sides of the bore 24 and each of said rollers H,

is adapted to contact the inner surfaceof the wall ofa cylinder 12 below the pro ection 16 which may occur at theupper end of the cylinder wall. Each roller 26 is formed at its upper end with a flange 32 of greater diameter than the roller and adapted to contact the top" surface of the cylinder or engine block and thereby assist in supporting the tool in place relative to'the cylinder as shown in Figure 2. Below the flange 32, each roller is formed with an annular groove 34 which is designed to embrace or permit clearing of the ledge or ranged above the cutter blade 38. The stop member 42 is formed-of a vertically arranged plate having a stem 44 slidably mounted in the upper part of the carrier member 20.

The stop member 42 may be adjusted in a lateral direction by adjusting the position of the screw 46 which is threaded in the carrier member and engages the inner end of the stem 44.. When so adjusted, the stop member. is held in place by a set screw 48 threaded in the top of the carrier member 20 for radially engaging the stem 44.

The carrier member'20 is equipped with a roller 50 which is arranged below the cutter blade 38 and stop member 42 and en tirely below the level of the ledge 16 of the cylinder wall. The roller 50 is seated in and projects slightly from a recess 52 in the carrier member andis mounted on a vertical pin 54.

An adjusting screw 56 is horizontally threaded through a lug 58 formed on the upper part of the carrier member 20 and has one end extended loosely through a lug 60 formed on the upper part of the main body member 18. The screw 56 is formed at one end with a kerf 62 toreceive a screw.

driver and at the opposite end is formed gage the outer face of the lug.

Between its ends the adjusting screw 56 is provided with a rigidly mounted collar 66 and a coil spring 68 is mounted onsaid screw between the collar 66 and the adjacent face .of the lug 60.

For use of the tool the sto'p'member 42 is first adjusted by means of the'screw 46 until its inner face is exactly in line with the outer face of the roller 50 and is locked in such position by means of the set screw,

48. The inner face of the stop member 42 provides a cutting limit for the blade 38 and eliminates any possibility that the blade with a removable head 64 which may enwill out too deep. It also serves to maintain the cut in exact conformity to the cylinder wall.

After the adjusting screw 46 has been properly set, the stop member 42 may be removed to permit removal and grinding of the cutter blade 38, after which the stop member can be replaced to exact position providing the position of the adjusting screw has not been disturbed in the meantime. I

In practical use thetool is placed in position within the upper end of the bore of a cylinder and bymanipulation of the adjusting screw 56, the tool is expanded to fit the bore of the particular cylinder. In other words the carrier member 20 is adjusted outwardly or away from the body member 18 so that the normal span would be slightly greater than the diameter of the cylinder.-

the cutter blade and as the tool is rotated the blade cuts away the projecting portion 16 until such time as the cutting edge comes iirto contact with the inner face of the stop Any rotating the tool. member 18 formed with an angular opening 70 in its top to receive the shank 72 of a socket wrench or T bar 74.

As the tool is rotated the rollers 26 and 50 travel in contact with the interior surface of the cylinder while the flanges 32 and the lower edge of the stop member 42 travel on the upper surface of the cylinder block and serve to hold the tool in place. The contact of the rollers with the interior surface of the cylinder causes the blade to conform to the contour of the cylinder wall so that the blade 38 cuts away the projection 16 in conformity with such contour. Inasmuch as the outer periphery of the roller 50 is in exact vertical line with the inner face of the stop member 42, it follows that the cutting operation will be automatically terminated when the projecting ledge 16 has been cut away to the proper amount to conform to the worn cylinder wall, irrespective of what its contour may be.

By reason of the employment of the expanding screw 56 and the yielding compression afforded by the spring. 68, the body member 18 and carrier member 20 are forcibly expanded within the cylinder and the desired means may be provided for ated by manipulating the wrench or hand I have shown the body tool 74 so that the projecting ledge 16 is- I easily and quickly cut away and theupper partpr the cylinder is caused to conform to the worn part of the wall below it.

While this tool has been especially designed for use on automobile engines, it is obvious that it may be applied in connection with any cylinder that'has a similar projecting portion to that indicated by the numeral 16 and I do not desire to be understood as limiting myself'to the exact method of use or the particular purpose herein set forth.

I claim as my invention s 1. 'An internal cutting tool for dressing cylinder walls and the like, comprising a body, rollers pivoted on the body and adapted to travel in contact with the wall adjacent the portion to be dressed, a carrier member having a sliding connection with said body, a roller pivoted on said carrier member, said body and carrier being formed with parallel lugs, a screw threaded through one of said lugs and having a swivel connection with the other and providing means for adjusting the span of the rollers for use in bores of difierent diameters, a cutter blade carried by the carrier, means for causing said blade to be advanced? toward the work, a stop member adjustably mounted on the carrier and adapted to be engaged by the blade for stopping the advance of the latter when the operation has been carried to the required extent, and

means for rotating the body and carrier..

7 2. An internal cutting tool for dressing cylinder walls andithe like, comprising a body, rollers pivoted on the body and adapted to travel in contact with the wall adjacent the portion to be dressed, a carrier member having a sliding connection with said body, a roller pivoted on said carrier member, said body and carrier being formed with parallel lugs, a screw threaded through one of said lugs and having a swivel connection with the other, an expansive spring coiled on said screw thereby providing yielding meansfor adjusting the span of the rollers for use in bores of diiferent diameters, a cutter blade carried by the carrier, means for.

causing said blade to be advanced towai d the work, a stop member adjustably mounted on the carrier and adapted to be engaged by the blade for stopping the advance of the latter when the operation has been carried to the required extent, and means for rotating the body and carrier.

3. Aninternal cutting tool for dressing cylinder walls and the like, comprising a body, rollers pivoted on the body and adapted to travel in contact withthe wall adjacent the portion to be dressed, a cutter blade carried by the body, means for causing said blade to be advanced toward the work, a

' stop member adjustably mounted on the body and adapted toqbe engaged by the blade for stopping. theadvance of the latter when the operation has been carried to the required extent, and means for rotating the body, some of said rollers being formed with enlarged port-ions overhanging the end of the cylinder for supporting the tool in its rotary movement and also being formed with peripheral grooves beneath the enlarged portions for embracing the part to be dressed.

4. An internal cutting tool for dressing cylinder walls and the like, comprising a pair of relatively adjustable body members,

the blade, said stop member adapted to be engaged by the blade to terminate the cutting operation, and also having a portion adapted to be aligned with the periphery of one of said rollers for causing the cutting operation to conform to the contour of the wall over which said roller travels.

5.An internal cutting tool for dressing cylinder walls and the like, comprising a main body member adapted to be mounted in a cylinderbore, a carrier member mounted for lateral adjustment relative to said body member, a screw connection for initially adjusting the relative position of the carrier and body members, a yielding pressure means acting to force said carrier and body members apart,'a roller pivoted on the carrier member for traveling engagement with the cylinder wall adjacent the portion to be dressed, a spring pressed cutter blade mounted in said carrier member, and a stop member mounted on said carrier member, having a portion in line with the periphery of said roller and adapted to be engaged by said blade for stopping the cutting operation in conformity with the contour of that part of the cylinder wall engaged by said roller.

- 6. A reaming tool for cylinder bores and held in forcible contact with the cylinder walls by action of said resilient means, a

carrier member in line with one of said guide means and adapted to be engaged by said cutter for limiting its cutting operation resiliently mounted cutter carried by 'said carrier member, and a stop member on said in conformity with the contour of the surface engaged by said guide means.

7. An internal cutting tobl for dressing cylinder walls and the like, comprisin" a rotatable body, said body being forme in a plurality of relatively movable parts, guide means on the'body adapted to travel in contact with the cylinder wall at one side of the portion to be dressed, a cutter blade carried by one part of said body, resilient means for causing said blade to be advanced to- Ward the work, expansive pressure means acting with respect to the parts of said body for causing the guide means to forcibly engage and follow the contour of thecylinder bore, and a stop member carried by said one part of the body for engagement by said blade, said stop member being arranged in line with a wall engaging element of saidguide means whereby the advancement of the cutter blade will be automatically limited in conformity with the contour of the wall engaged ,by said guide means.

Des Moines, Iowa, March 5, 1930.

\ CARL A. OLSON. 

